This is Augusta Ada King, Countess of Lovelace, today known simply as Ada Lovelace (Wikipedia). This is an 1838 portrait of her by Margaret Sarah Carpenter. Ada is a famous steampunk for a couple of reasons: the sole legitimate child of the poet Lord Byron. Lovelace was also an avid mathematician.
For her work on the difference engine, an early mechanical computer in the 19th century, she is also commonly credited as the first computer programmer. The computer programming language Ada is named after her.
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